The show was awesome, but had a few too many Time Traveling Terminators. The Connors burned all they could, but it looks like there were plenty of scrap to build a whole new Skynet around. Remember in T2 when the chip and arm of the first T-800 were such a threat to humanity? Now they're outdated models and everyone has a piece of a T-888!
You'd think Skynet would have uploaded itself with T-800s and started producing infiltrators from day one. At least its only 14 years after JD and they're figuring this out. According to T1, they had just started making T-800s in 2029, THIRTY TWO YEARS after the 1997 JD!